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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        ul{
            list-style:none;
            border: lightseagreen solid 1px;
            display: none;
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.box{
width: 500px;
height: 500px;

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.box1{
    width: 500px;
    height: 50px;
    background-color: khaki;
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p{
    float: left;
    width: 100px;
    height: 30px;

    color: lavenderblush;
    text-align: center;
    line-height: 30px;
    background-color: lawngreen;
}
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</head>
<body>
    <div class="box">
        <div class="box1">
            <p>第一结课</p>
            <p>第二结课</p>
            <p>第三结课</p>
        </div>

            <ul style="display:block;">
                <li>大笨猪</li>
                <li>大笨猪</li>
                <li>大笨猪</li>
                <li>大笨猪</li>
            </ul>
            <ul>
                <li>笨猪</li>
                <li>笨猪</li>
                <li>笨猪</li>
                <li>笨猪</li>
            </ul>
            <ul>
                <li>小笨猪</li>
                <li>小笨猪</li>
                <li>小笨猪</li>
                <li>小笨猪</li>
            </ul>
    </div>
</body>
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